Temperature responsive device



March 28, 1944.

J, G. BOOTH EI'AL TEMPERATURE RESPONSIVE DEVICE Filed Jan. 18, 1941 INVENTOR. JOHN G. BOOTH LOUIS GESS mounted.

Patented Mar. 28, 1944 j msross rve pavlca John G. not; Philadelphia, and Louis. Gess, Jenkintown Pa assignors' to TheBrown' In- 1 trument Company, Philadelphia, Pa", a coriporation of rennsy lvania.' V ApplicatioriJannai-y 18, 1941, Serial 804314.981

V i nvention relates to] improvements in thermoisensitive devices and more particularly to therrnonieter bulbs It iS'an object 'ofthe invention to provide a.

thermosensitive element having a large non-im pedingj surface sci-that the element "will respond 'quickly to "temperaturecha'nges." Ibis, ls a l ob ect ofth nv ti to Pr v a streamlined thermometer bulb which is practically unafiectedby flowing fluid-f The I bulb of thisinv ention isdesignedto minimize the torques 7 produced by iluidlflow 'wiii'n viould'bend of break other types or bulbs," 'and'iurther; is designed-ta present 'a strong s urla'ee will not be broken when hit by heavy "particles that ;might be' suspended "in fa; fluid. The streamlines Q ofa thermometer, bulb for this type have an-accompanyingf advantage in thatTthe flowQ of fluid is substantially unimpeded t'neutuibf-u A further: object of this invention is to mini- 7 mizeerrorsgenerally introduced in a. measuring system ofthe type using a thermomekr 'bulb due to (the. conduction of heat ;between'thejbu1b and'the container, or" pipe in' which the fbulbfis Another objector the intent on toprovide ingtneeienn nt"beabsorbedtc an extent sum clent to 'preventbreakageiof the element. {.1} f.

means a for resilientlyfniountin'g' an element so that shocksfresultingf from heav particles strikterize thisfir ivention are pointed'out wnnptrtmularity inthe clainis annexed to] and. run ing a v.1 st ndin ont erin e fln ne er t ad t u e; efer ncegshould a to the www- The drawing illustrate/eta sttotnnta new for the thermosensitive z'device' otrzthis invention associated with a measuring instrument. 1': 1:;-

Reterringlto the drawing; the reference numer 9.1 li indicateaa wali;z;.v'rms waniomi ht t t communication with the chamber 19. .The'caplllary tube' n isillustra'ted' as providing means for I communicating pressure cha'ng'es in' chamber I 8 cover the hole ,hold the thermo-sensitlve element in-place, and provide meansto adjust the positional relation of the therma -sensitive elementin the aperture. 7 For illustration, threaded studs l4 secured inthe reinforcement member"! I are shown adaptedto pass through holes in plates I3 andnuts i5 cooperating'with the threaded studsprovide adjustable-means to hold the cover plate l3 in-place it is obvious, however; that any other means to accomplish this end may be used,

The thermosensitive element of this invention is illustrated as having a shankiifiland a flanged .end H. Ahemispheri cal wants is "fastened to the-flange I I by welding, .or'other suitable process,

" soas to form ach'amber IBMa-Q'Ihe wall Iii-extends into the tank" or vat and is contacted piptheiluid therein. The vchamber lfl contains a thermoresponsive fluid which will change in pressure in response toflc'hanges in temperature of the well 18 and hence the fluidin the tank orvate -Since.

- the hemispherical'wall "l8 providesan extremely largearea subject to the temperature oithefluid in the tank or vat, thedevice is-very sensitivej An entry plug 20 and a" protecting tube 2| secured to the shank I6 and'to 'eachother, asby solderingQprovide conventional means to introduce a capillary tube '22 through thesh'ank it into direct with'a spiral" Bo'urd on tube M 01 its equivalent Q structurein a remote indicating, recordingor controllingfinstrunient 32. -'It should be understood, however,,that'.-the n eans for indicating, reco ding and/or controlling fo'rn no part'of the "present invention 'and anyj'other suitable type 1 maybe used. armoured cable 23 may be prolvided to, piotect tnegcap l ary. tube mm being crushed, or bent throughitoo small an angle. For the purpose mounting; the thermo-sensl i eelm nteii li bii i H s vi t t-fl'hiscmat l we kts. itrpsw a i le ageof fluid from the conteinerfandifurther pro- 40f heate w en the 151 b f hf fi o ei rl find the h rm n it ve. e ement-1t i wnt e -;;.sorbinz qualitiespr; such resilient niaterials ave the viurther. adventfleefie A breaknetot-thebu h sbulb' w refs mkrby heav actualzd sisn f the flange and said resilient member free of any .contact with said container and both the protective and resilient members located between said flange and said part, adjustable means to attach said part to said container and means adjustable along said shank to move said flange toward said part to press said resilient member into engagement with the sides of the opening in said container.

4. A thermometer bulb assembly to be used in plate, a disc-surrounding said shank and an annular expansible member also surrounding said shank and located between said disc and said plate, and means on said shank beyond said plate to draw said bulb toward said plate and thereby expand said expanslble member into engagement with the sides of the opening in said container.

5. A thermometer bulb assembly to be used in taking the temperature of a container that is provided with an opening through which said bulb may be inserted comprising a part fastened to said container and surrounding the opening therein, said part g formed with a countersunk portion on its surface away from the container, anexpansible member slightly smaller than said opening to be received therein and being provided with a flange adapted to lie in said countersunk portion, a thermometer bulb having a flat surface thereon projecting into the container, said bulb also having a shank thereon pro- Jecting through said expansible member, a plate adapted to lie against the expansible member and the flange formed thereon, said plate being formed with an opening through which said shank extends, and means cooperating with said shank to draw the flat surface of said bulb and said plate together to thereby expand said expansible member tightly into engagement with the sides of the opening in said container, and to compress the flange on said expansible member between said part and plate.

B. A thermometer bulb assembly adapted to be placed in an opening in a container whose temperature is to be measured comprising a thermometer bulb that is substantially hemispherical in shape, a shank projecting from the flat surface of said bulb, said shank receiving in the order named an annular disc, slightly smaller in diameter than the opening in said container, an expansible member of a size to fit in said opening and having a flange thereon larger in size than said opening, a part larger than said flange and a drawing and holding member, said assembly being inserted in said opening with said disc substantially flush with the 'inner end of said opening and said flange lying against the container at the outer end of the opening, said drawing and holding means operating on said shank to pull said bulb towardsaid plate and thereby expand said expansible member into snug engagement with the sides of opening and means to attach said part to the container to draw said flange snugly into engagement therewith.

JOHN G. BOOTH.

LOUIS. GESS. 

